A current-carrying conductor in an electromagnetic switch moves a contact when it experiences a magnetic force. The conductor is at right angles to the magnetic field. A force of 0.060 N is required to move the contact. The magnetic flux density is 0.25 T0.25\ \text{T}0.25 T and a length of 0.12 m of the conductor is inside the field.
Calculate the current in the conductor.
Use the equation
F=B×I×lF = B \times I \times lF=B×I×l
86 exam-style questions on Edexcel GCSE Physics 12.3 The motor effect, covering 12.3.1 The motor effect, 12.3.2 Fleming's left-hand rule, 12.3.3 Force on a conductor, and 12.3.4 Electric motors. Each one has a worked solution and a mark scheme showing where the marks go.